Two-Dimensional Differential Demodulation for 64-DAPSK Modulated OFDM Signals

2010 7th IEEE Consumer Communications and Networking Conference Pub Date : 2010-01-09 DOI:10.1109/CCNC.2010.5421843

Min Gong, Yusheng Ji, Han Han, Xiaokang Lin

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Abstract

A novel two-dimensional differential demodulation (2-D DD) algorithm, which exploits both the time and frequency dimensions by using the orthogonal frequency division multiplexing (OFDM) frame structure, was investigated for 64-differential amplitude and phase shift keying (DAPSK) modulated OFDM signals. Without changing the transmitter, the proposed algorithm based on graph attempts to search for a more confident bypass, probably containing multiple DD operations, to demodulate one 64-DAPSK symbol rather than conventional direct DD. In order to carry out the optimal path searching process, the soft decision metrics of the amplitude ratio and phase difference were derived by making use of a Gaussian approximation. Simulation results show that the proposed algorithm can obtain substantial performance gains with reasonable computational complexity for uncoded AWGN and frequency selective fading channels. In addition, it is advantageous to withstand the Doppler effect, which is hence suitable for high mobile (e.g., in a car or train) broadband wireless access (BWA) systems.

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64-DAPSK调制OFDM信号的二维差分解调

研究了一种利用正交频分复用(OFDM)帧结构同时利用时间和频率维度的二维差分解调(2-D DD)算法，用于64差幅相移键控(DAPSK)调制的OFDM信号。在不改变发射机的情况下，基于图的算法试图寻找更可靠的旁路(可能包含多个DD操作)来解调一个64-DAPSK符号，而不是传统的直接DD。为了进行最优路径搜索过程，利用高斯近似推导了幅值比和相位差的软决策度量。仿真结果表明，在无编码AWGN和频率选择性衰落信道中，该算法可以在合理的计算复杂度下获得可观的性能提升。此外，它有利于承受多普勒效应，因此适用于高移动(例如，在汽车或火车上)宽带无线接入(BWA)系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 7th IEEE Consumer Communications and Networking Conference

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